Half to feancis c



(No Model.)

.0. H. HERSBY.

DRIBR. No. 263,518. Patented Aug. 29, 1882.

UNITED STATES PATENT OFFICE.

CHARLES H. HERSEY, OF BOSTON, MASSACHUSETTS, ASSIGNOR OF ONE- HALF TO FRANCIS C. HERSEY, OF SAME PLACE.

DRIER.

SPECIFICATION forming part of Letters Patent N o. 263,518, dated August 29, 1882.

Application led July 12, 1882. (No model.)

T all whom it may concern:

Be it known that I, CHARLEs H. HERsEY, of Boston, county of Suffolk, State of Massachusetts, have invented an Improvement in Driers, of which the following description, in connection with the accompanying drawing, is a specification.

My invention relates to driers, and has for its object to produce a drier for economically vro treating material containing a large amount of moisture.

In another application for Letters Patent I have shown a drying apparatus consisting of a drier operated by steam heat, substantially T5 such as shown in Letters Patent granted to me April 25, 1871, in combination with a primary chamber through which the material to be dried is passed on its way to the said drier operated by steam heat. In the said appli- 2o cation the primary chamber was formed as a portion ofthe drum of the steam-heated drier, and rotated therewith to agitate the material passing through it, the said chamber being located in a furnace, and consequently exposed to far greater heat than that derived from the steam in the other portion of the drum, so that the wet material, in passing through the said primary chamber, has the greater part of its moisture removed before 3o entering the portion of the drieryheated by steam, in which the operation of drying -is completed without danger of burning the said material.

The present invention consists mainly in making the primary or furnace-heated chamber stationary and independent of the drum ot' the steam-drying portion of the apparatus, and in providing agitating arms or stirrers in the said drum to agitate the material being 4o dried.

The drawing shows in longitudinal section a drying apparatus embodying this invention. The portion ofthe drier that is operated by steam heat may be of any suitable or usual construction, it being` shown as substantially the saine as in Letters Patent granted to me, hereinbefore referred to.

The drum a, provided with blades or buckets b, and containing a heatingcylinder, c, is 5o mounted on rollers d in a slightly-inclined position, its lower end being open and its higher end being provided with a flange, f, encircling the end of the prim ary or furnace-heated chamber y, which opens directly into the drum a.

The heating-cylinder c is provided with the usual inlet and outlet steam-pipes, the former, h, rotating with the said cylinder and drum, which are actuated by the gear j and pinion j on the shaft jas described in the beforementioned patent. 6o

The chamber g is mounted in a furnace, 7c, and is provided with a chute or inlet-passage,

m, for the introduction of the material to be dried.

A series of agitating arms or stirrers, 10,- are mounted to rotate in the chamber g, to agitate the material passing through the said chamber, they beingshown in this instance as mounted on the steam-pipe h and rotating therewith. The chamber g is opened at its 7o upper side into thc furnace, as shown at p, to thus permit the escape of the steam and moisture that is expelled from the material passing through it and the drum a, a current of air being caused to iow through the latter toward the said chamber by the difference in ltemperature or other means.

It is obvious that the invention is not limited to any particular kind of steam drying apparatus. It' desired, the outer drum, a, may 8o be stationary, it being made as a steamjacket, and the material agitated therein by arms or stirrers similar to those employed in the chamber g.

I claim- 1. The combination, with the steam drying apparatus, of the primary chamber stationary in a furnace, and agitating arms or stirrers movable in the said chamber, substantially as described.

2. The steam drying apparatus consisting ofa drum and heating-cylinder therein, having inlet .and outlet steampipes, combined with the furnace-heated primary chamber and agitating arms or stirrers therein, and means Vto rotate the said drum-cylinder and stirrers,

substantially as described.

In testimony Whercot'I have signed my name to this specification in the presence of two subscribing witnesses.

CHAS. H. HE RSEY.

Witnesses:

GEO. W. GREGORY, Jos. P. LIVERMORE. 

